Some Matters Needing Attention In The Use Of Water Hardness Tester

Some Matters Needing Attention In The Use Of Water Hardness Tester

• When replacing the indenter or anvil, pay attention to the contact parts to be cleaned. After the replacement, it is tested several times with a steel sample of a certain hardness until the hardness values obtained twice in succession are the same. The purpose is to make the contact part of the indenter or anvil and the testing machine compact, and the contact is good, so as not to affect the accuracy of the test result.
• After the hardness tester is adjusted, when the hardness is measured, the first test point is not used. The measured value is not accurate due to the fear that the sample is not in good contact with the anvil. After the first point is tested, the hardness tester is in the normal operating mechanism state and then the sample is formally tested, and the measured hardness value is recorded.
• When the test piece allows, generally select at least three hardness values for different parts, take the average value, and take the average value as the hardness value of the test piece.
• For the shape of the test piece, the corresponding shape of the block should be used, and it can be tested after being fixed. The round test piece is generally tested in a V-groove.
• Before loading in water hardness tester, check whether the loading handle is placed in the unloading position. When loading, the action should be light and steady. Do not use too much force. The loading handle should be placed in the unloading position after loading, so as to avoid the instrument being in a load state for a long time, plastic deformation occurs, which affects the measurement accuracy.

Note: The water hardness tester test values cannot be directly compared with each other and can only be converted by the hardness comparison table.